This is incorrect. https://sellercentral.amazon.com/gp/help/external/200141480 https://sellercentral.amazon.com/gp/help/external/200141480 explicitly stated tha

This is incorrect. https://sellercentral.amazon.com/gp/help/external/200141480 https://sellercentral.amazon.com/gp/help/external/200141480 explicitly stated that they track which seller it comes from. They don't need to label each product, they just need to know which location it came from and store different sellers products in different locations, which they do.